The maximum 'Number of rows' in 'Musical keyboard settings' is currently 4.
I propose this be raised to 10.
At the moment it is possible to play two octaves using an isometric 4ths layout (type: uniform, row shift: 5) in portrait mode on a mobile phone.
With the increase it would be possible to utilise all the space and get 4 or 5 octaves onscreen.
The isometric 4ths layout is already fun to play (it's the default layout on the linnstrument) and would benefit further from being able to stack it higher.